copper ionization
No. There are no saltwater rivers, but some river deltasare saltwater systems where they meet the ocean (or other saltwater body).
You can attach saltwater system to non-Intex pro series pool.
No, a saltwater pool does not need to be covered.
Yes.
There a few juices that you can get to help boost the immune system. The best juice to get would be orange juice.
Yes, you can.
To boost your immune system.
There are several juices you can drink that boost the immune system. The best juice that would help would be orange juice.
Freshwater
sex
Typically, one should stay on probiotics for at least two weeks for an immune system boost.
Yes, one such system is the popular ACE Saltwater Sanitizing system for HotSpring hot tubs.